added a 'koch ic' command for easier adhoc testing of IC (#17508)

* added a 'koch ic' command for easier adhoc testing of IC
* IC: progress
* IC: enable generics test
* make tests green

koch.nim

@@ -458,8 +458,8 @@ proc temp(args: string) =
       inc i
 
   let d = getAppDir()
-  var output = d / "compiler" / "nim".exe
-  var finalDest = d / "bin" / "nim_temp".exe
+  let output = d / "compiler" / "nim".exe
+  let finalDest = d / "bin" / "nim_temp".exe
   # 125 is the magic number to tell git bisect to skip the current commit.
   var (bootArgs, programArgs) = splitArgs(args)
   if "doc" notin programArgs and
@@ -483,6 +483,22 @@ proc xtemp(cmd: string) =
   finally:
     copyExe(d / "bin" / "nim_backup".exe, d / "bin" / "nim".exe)
 
+proc icTest(args: string) =
+  temp("")
+  let inp = os.parseCmdLine(args)[0]
+  let content = readFile(inp)
+  let nimExe = getAppDir() / "bin" / "nim_temp".exe
+  var i = 0
+  for fragment in content.split("#!EDIT!#"):
+    let file = inp.replace(".nim", "_temp.nim")
+    writeFile(file, fragment)
+    var cmd = nimExe & " cpp --ic:on --listcmd "
+    if i == 0:
+      cmd.add "-f "
+    cmd.add quoteShell(file)
+    exec(cmd)
+    inc i
+
 proc buildDrNim(args: string) =
   if not dirExists("dist/nimz3"):
     exec("git clone https://github.com/zevv/nimz3.git dist/nimz3")
@@ -705,6 +721,7 @@ when isMainModule:
       of "fusion":
         let suffix = if latest: HeadHash else: FusionStableHash
         exec("nimble install -y fusion@$#" % suffix)
+      of "ic": icTest(op.cmdLineRest)
       else: showHelp()
       break
     of cmdEnd: break